CODEWITHSUNDEEP
c++namespacesatl
Dhanalakshmi Subbiah
Dhanalakshmi Subbiah

Reputation: 21

Not able to use System namespace in Visual C++ ATL project

I am having a ATL project where in I have to use System namespace to set environment variables. I tried:

#using <mscorlib.dll>
using namespace System;

in my dllmain.cpp file.

While building, I got:

fatal error C1190: managed targeted code requires a '/clr' option even after adding /clr option project->properties->common language runtime support.

If I remove #using mscorlib.dll, I am getting:

error C2871: 'System' : a namespace with this name does not exist

How can I use this namespace in my ATL project?

Upvotes: 1

Views: 4587

Answers (1)

Roger Liu
Roger Liu

Reputation: 1888

See this link from MSDN.

I quote the answer here:

As you are including a reference to mscorlib.dll you need to let the compiler know that you are targetting the .NET Runtime. The compiler switch that controls this is /clr - hence the error message you are seeing. To enable this option from the project system in the Solution Explorer pane right-click on your project, select Configuration Properties.General and then select "Common Language Runtime support" and from the drop-down list select "Common Language Runtime Support (/clr)".

In C++ identifiers are case-sensitive: I suspect that the name should be System::Console.

Upvotes: 1

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